A mutation occurs during the development of muscle cells but not in blood cells. Different genes are activated in muscle cells than in blood cells. Muscle cells experience different environmental influences than blood cells.
A A mutation occurs during the development of muscle cells but not in blood cells. B Different genes are activated in muscle cells than in blood cells. C Muscles cells experience different environmental influences than blood cells. D Muscle cells are produced by the brain, but blood cells are produced by the heart.
